// This creates a tiny JFrame with a menu, which changes the LookAndFeel.

package looksAndFeels;

import javax.swing.*;
import javax.swing.UIManager.*;
import java.awt.event.*;

public class ThemeChanger extends JFrame {

	ThemeChanger __instance;
	
	public ThemeChanger() {
		super("Swing Theme Changer");
		__instance = this;
		this.setSize(400, 200);
		
		JMenuBar appMenu = new JMenuBar();
		appMenu.add(makeLaFMenu());
		this.setJMenuBar(appMenu);
		
		this.setVisible(true);
	}
	
	private JMenu makeLaFMenu() {
		JMenuItem tempItem;
		JMenu lafMenu = new JMenu("Supported Themes");
		LookAndFeelInfo[] supportedLAFs = UIManager.getInstalledLookAndFeels();
		for (int ii = 0; ii < supportedLAFs.length; ii++) {
			LookAndFeelInfo currentLAF = supportedLAFs[ii];
			tempItem = new JMenuItem(currentLAF.getName());
			tempItem.setActionCommand(currentLAF.getClassName());
			tempItem.addActionListener(new myListener());
			lafMenu.add(tempItem);
		}
		
		return lafMenu;
	}
	
	class myListener implements ActionListener {

		public void actionPerformed(ActionEvent event) {
			try {
				UIManager.setLookAndFeel(event.getActionCommand());
			} catch (Exception e) {
				; // No exceptions will happen (barring some unforeseen catastrophe),
				  // because we only grabbed the supported LaF's.
			}
			SwingUtilities.updateComponentTreeUI(__instance);
		}
		
	}
	
	public static void main(String[] args) {
		new ThemeChanger();
	}

}